i'm running on a 885W Real power so i don't think the problem is power or overclocking and temp ! something that is so interesting is before crash on GTA My car flying or i couldn't walk and ... ! what's the problem ?!

Anyway Shahryar_NEO welcome aboard. How did you install the 9.1 drivers? Also do you have a GPU on your board? One big thing that helps us trouble shoot problems is knowing the specs of your system. Would you mind posting them?

it's not possible to use crossfire with 8400GS and 4850 ! so it's only a 4850 now but before i used 8400GS

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I didn't say it was. But that didn't mean you didn't have two cards installed. Anyway if you had another an Nvidia card in there before than you defiantly need to do a good cleaning of the registry. Personally I always redo my whole OS when I change brands like that. Its not necessary however. I just like to play it safe

I didn't say it was. But that didn't mean you didn't have two cards installed. Anyway if you had another an Nvidia card in there before than you defiantly need to do a good cleaning of the registry. Personally I always redo my whole OS when I change brands like that. Its not necessary however. I just like to play it safe

Read the directions man! It does a far better cleaning in safe mode. It can't delete registry entries if they are in use. Here read this.

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lol ...okay OS safe mode ...I see.... Directions what are they ...I live in america where directions are the last thing you do ...lol